Wednesday

July 23, 2014

July 23, 2014

Posted by **Jess** on Sunday, September 9, 2007 at 6:44pm.

-Hfinal=hinitial+ vinitial*t -4.9t^2

0=0+10t-4.9t^2 when I solved for t I got .49t.Am I suppose to plug .49t back into the equation?

A man leans over the edge of a cliff and throws a rock upward at 4.9m/s. How far below the level from which it was thrown is the rock 2 seconds later?

-For this problem I am suppose to get 9.8m/s and instead got -29.4 m

y = 4.9t - 4.9 t^2. Plug in t = 2s and solve for y.

y(at t=2s) = 9.8 - 4*9.8 = -29.4 m

- Physics -
**bobpursley**, Sunday, September 9, 2007 at 6:59pmThe first is a quadratic. Either factor it, or use the quadratic equation.

On the second, you cannot get 9.8 m/s as a distance, that is a velocity.

**Related Questions**

Physics - If a projectile is fired straight up at a speed of 10 m/s, the total ...

Physics ASAP - I have a few questions that I need help with and that need to be ...

Phyics Word Problems - I have a few questions that I need help with and one that...

Physics - If a projectile is fired straight up at a speed of 10 m/s, the total ...

Physics - If a bullet was fired straight up at a speed of 30 m/s what would be ...

Physics - If a bullet was fired straight up at a speed of 30 m/s, what would be ...

Physics - If a bullet was fired straight up at a speed of 30 m/s, what would be ...

Physics - If a bullet was fired straight up at a speed of 30 m/s, what would be ...

Physics Probelms ASAP - Could you please check my work and help me with a couple...

AP Physics - Could you please help me out with the following problems please? If...